Son of Eliphaz, and grandson of Esau, Genesis 36:12. It is not certain that any distinct mention is made in the Bible of his posterity, people called Amalekites being in existence long before, Genesis 14:7; Numbers 24:20.
These dictionary topics are from American Tract Society Bible Dictionary published in 1859. Public Domain, copy freely.
Rand, W. W. "Entry for 'AMALEK'". "American Tract Society Bible Dictionary".